Surface and adhesion properties study of prophylactic lubricants border layers on metallic surface

Abstract

This study is aimed at developing the special petroleum products, namely, preventive lubricants (PL) used in the field of solid minerals transportation. The surface and adhesion properties characteristics of the prophylactic compositions developed earlier on the basis of thermodestructive and thermocatalytic processes products of oil refining are investigated. It has been found that preventive lubricants contain a significant amount of surfactants, such as resins, asphaltenes and other polyaromatic hydrocarbon compounds. The main quantity of compounds with high surface activity is contained in high-boiling oil fractions, and during its processing it is concentrated in the oil residue - tar, which was used as a depressant thickening additive in mixtures of preventive lubricants. The dependence between the content of tar in the composition of lubricants and their adhesion ability, surface tension, wetting and lubricating properties is revealed. Surface properties of preventive lubricants were assessed by parameters such as surface tension and wetting contact angle. Studies have confirmed that the introduction of tar as a depressant additive improves the low-temperature characteristics of lubricants, as well as its small concentrations cause a decrease in the value of surface tension and the contact angle of wetting, which improves the surface and adhesion and wetting properties of the PL. To protect the metal surfaces of mining transport from direct contact with a wet finely dispersed transported material, it is recommended to use a composition of catalytic cracking process gasoil mixtures with a tar content of 2 to 5% under low temperature conditions.